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Application of coal gangue as converter slagging inhibitor and methods for converter slag suppression

A coal gangue and converter technology, applied in the field of slag suppression, can solve problems such as economic impact, cost increase, and complicated process, and achieve the effects of low price, avoiding waste, and simple processing technology

Active Publication Date: 2017-10-10
TANGSHAN STAINLESS STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two methods can achieve better results, but due to the complexity of the process, the cost will increase significantly after the ball pressing and other links, which will greatly affect the economy of the process; waste of resources

Method used

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  • Application of coal gangue as converter slagging inhibitor and methods for converter slag suppression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: The method for suppressing slag in the converter adopts the following specific process steps.

[0029] Conventional smelting in a 100-ton converter; the molten iron entering the furnace has a C content of 4.23wt%, a Si content of 0.66wt%, a P content of 0.0133wt%, and a Ti content of 0.008wt%. The temperature of the molten iron is 1320°C. The weight of molten iron is 105.3 tons, and the weight of scrap steel is 15.2 tons.

[0030] Due to the high content of silicon in molten iron, when the amount of oxygen blown into the converter reaches 25%, the flue gas detection system shows that the CO content rises faster, indicating that there is a risk of splashing; add 100kg of slagging agent through the high-level silo, and other processes continue to follow The model setting was automatically executed, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End point: End point C is 0.054wt%, P is 0.013wt%, and temperature is...

Embodiment 2

[0031] Embodiment 2: The method for suppressing slag in the converter adopts the following specific process steps.

[0032] Conventional smelting in a 100-ton converter; the C content of molten iron entering the furnace is 4.33%, the content of Si is 0.42%, the content of P is 0.0130%, and the content of Ti is 0.008%, and the temperature of molten iron is 1240°C. The weight of molten iron is 105.8 tons, and the weight of scrap steel is 15.9 tons.

[0033] Due to the low temperature of molten iron entering the furnace, when the amount of oxygen blown into the converter reaches 30%, the flue gas detection system shows that CO is always lower than 30%. Due to the low temperature of the molten pool, a large amount of FeO accumulates, indicating the risk of splashing; The slag agent was 150kg, and other processes continued to be automatically executed according to the model settings, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End po...

Embodiment 3

[0034] Embodiment 3: The method for suppressing slag in the converter adopts the following specific process steps.

[0035] Conventional smelting in a 100-ton converter; the C content of molten iron entering the furnace is 4.25%, the Si content is 0.50%, the P content is 0.0125%, and the Ti content is 0.028%, and the temperature of the molten iron is 1335°C. The weight of molten iron is 104.3 tons, and the weight of scrap steel is 16.2 tons.

[0036] Due to the high content of Ti content in the molten iron, the heating rate of the molten pool is too fast. When the oxygen blowing amount of the converter reaches 25%, the flue gas detection system shows that the CO content rises faster, which indicates that there is a risk of splashing; Other processes continued to be automatically executed according to the model settings, the CO content curve returned to normal, and no slag splashing occurred in the early stage. End point: End point C is 0.044%, P is 0.015%, and temperature is ...

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Abstract

The invention discloses an application of coal gangue as a slag suppressing agent for a converter and a method for suppressing slag in a converter. In the method, coal gangue is used as a base material of the slag suppressing agent, and the amount added each time is 1 to 2 kg / ton in the blowing process for suppressing slag. For steel, 0.2-0.5kg / ton of steel is added each time when suppressing slag in the furnace and tapping process. A small amount of slag inhibitor can achieve good slag suppression effect; it can effectively control the splashing in the converter blowing process. Due to the low price of raw materials and simple processing technology, the cost of the slag inhibitor is only 10% to 30% of the original process; and the waste of raw coal or magnesium resources is effectively avoided. This method is aimed at the situation that the iron oxide is too high and soft blowing in the blowing process, it is difficult to reverse the furnace at the end of the blowing, and the slag overflows after the supplementary blowing. The purpose of tapping. The method has no adverse effect on the environment, saves resources and reduces costs, and has popularization and application value in steelmaking production plants.

Description

technical field [0001] The invention relates to a technology for suppressing slag in the blowing process of a steelmaking converter, in particular to the application of coal gangue as a converter for suppressing slag and the method for suppressing slag in the converter. Background technique [0002] In the converter production process, FeO in slag plays an important role in the melting of slag and the control of phosphorus content. However, in actual production, the slag FeO is too high in the process, and the unbalanced reaction of slag and steel brings many problems to smelting. Excessively high FeO results in high iron consumption; the risk of splashing during the blowing process increases and pollutes the environment; the desulfurization capacity of slag is reduced; the oxidation of molten steel is improved, which affects the quality of molten steel and refractory materials; Definitely a safety hazard. [0003] The method of suppressing excessive FeO is generally to us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/36
Inventor 周泉林李阳邢金栋李鹏刘海波王肖周航赵铁成
Owner TANGSHAN STAINLESS STEEL
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